It is early days for me with the RePhone platform but I am working on a couple of projects. Probably the most interesting (well for me ) is a geofencing module that sends SMS alerts if it GPS location changes within a set amount. Can be used as a simple tracking device for things you expect not to move, like your car when it's parked.

I'm building a monitoring device for a small solar installation. We had problems with animals gnawing on the cables and the rephone kit will be used to send the weekly totals to a phone number via SMS.